FFA Horticulture CDE General Practice Exam

What structure supports the covering material of a greenhouse?

1. Greenhouse framework

2. Greenhouse base

3. Ventilation system

4. Foundation slab

The correct answer is: Greenhouse framework

The greenhouse framework is the critical structure that supports the covering material of a greenhouse. This framework typically consists of materials like wood, metal, or PVC that creates the skeletal structure of the greenhouse. It is designed to bear the load of the covering material, whether it is glass, plastic, or polycarbonate sheets, while also withstanding environmental stresses such as wind and snow. The greenhouse framework is essential not only for support but also for maintaining the integrity and shape of the greenhouse. It must be robust enough to ensure that the covering material remains in place, allowing for effective greenhouse function—such as controlling temperature and humidity while providing adequate light for plant growth. In contrast, the greenhouse base, ventilation systems, and foundation slabs serve different functions. The base provides stability, ventilation systems allow for airflow and temperature control, and the foundation slab offers a level surface for the structure. However, these components do not play a direct role in supporting the covering material itself, which is the primary function of the greenhouse framework.